To play this riff, first rest for 1 and a half beats. Bend the 1st note on the 13th fret with your 3rd finger, but let your 1st and 2nd finger help support the bend.
After playing the 4th note (a C note), quickly slide your hand down two frets so that the 3rd finger can also hit the note on the 11th fret (a Bb note).
